So let me describe by setup:
Coax Line carrying 8 signals in the range of 0.8 GHz to 2.2 GHz. Each spaced by 200 MHz.
This coax goes into a 1-to-8 Splitter. On the output (8 outputs) of the splitter there are 8 BPFs. Each filter has a different center frequency of it's particular channel.
Then there are 8 amplifiers.
Then each goes into its own mixer with corresponding LOs for down conversion to IF, etc.
My issue is that when I take the 1-to-8 splitter and terminate all 8 outputs with 50 terminations then I get really good return loss and corresponding swr at the input (S11). BUT when I put on the BPFs and terminate those outputs at 50 Ohms then my S11 (return loss) looking into the splitter again goes into the toliet.
Why is that and how can I rectify this situation if I want to use a splitter?
Secondly, if I can't use a splitter is a mux the only way? I would rather try to make the splitter work though.
I can post plots if need be.
Thanks for the help.
Coax Line carrying 8 signals in the range of 0.8 GHz to 2.2 GHz. Each spaced by 200 MHz.
This coax goes into a 1-to-8 Splitter. On the output (8 outputs) of the splitter there are 8 BPFs. Each filter has a different center frequency of it's particular channel.
Then there are 8 amplifiers.
Then each goes into its own mixer with corresponding LOs for down conversion to IF, etc.
My issue is that when I take the 1-to-8 splitter and terminate all 8 outputs with 50 terminations then I get really good return loss and corresponding swr at the input (S11). BUT when I put on the BPFs and terminate those outputs at 50 Ohms then my S11 (return loss) looking into the splitter again goes into the toliet.
Why is that and how can I rectify this situation if I want to use a splitter?
Secondly, if I can't use a splitter is a mux the only way? I would rather try to make the splitter work though.
I can post plots if need be.
Thanks for the help.